@Override
 public EngineException[] bulk(Bulk bulk) throws EngineException {
   EngineException[] failures = null;
   rwl.readLock().lock();
   try {
     IndexWriter writer = this.indexWriter;
     if (writer == null) {
       throw new EngineClosedException(shardId);
     }
     for (int i = 0; i < bulk.ops().length; i++) {
       Operation op = bulk.ops()[i];
       if (op == null) {
         continue;
       }
       try {
         switch (op.opType()) {
           case CREATE:
             Create create = (Create) op;
             writer.addDocument(create.doc(), create.analyzer());
             translog.add(new Translog.Create(create));
             break;
           case INDEX:
             Index index = (Index) op;
             writer.updateDocument(index.uid(), index.doc(), index.analyzer());
             translog.add(new Translog.Index(index));
             break;
           case DELETE:
             Delete delete = (Delete) op;
             writer.deleteDocuments(delete.uid());
             translog.add(new Translog.Delete(delete));
             break;
         }
       } catch (Exception e) {
         if (failures == null) {
           failures = new EngineException[bulk.ops().length];
         }
         switch (op.opType()) {
           case CREATE:
             failures[i] = new CreateFailedEngineException(shardId, (Create) op, e);
             break;
           case INDEX:
             failures[i] = new IndexFailedEngineException(shardId, (Index) op, e);
             break;
           case DELETE:
             failures[i] = new DeleteFailedEngineException(shardId, (Delete) op, e);
             break;
         }
       }
     }
     dirty = true;
   } finally {
     rwl.readLock().unlock();
   }
   return failures;
 }
 @Override
 public void delete(Delete delete) throws EngineException {
   rwl.readLock().lock();
   try {
     IndexWriter writer = this.indexWriter;
     if (writer == null) {
       throw new EngineClosedException(shardId);
     }
     writer.deleteDocuments(delete.uid());
     translog.add(new Translog.Delete(delete));
     dirty = true;
     if (delete.refresh()) {
       refresh(new Refresh(false));
     }
   } catch (IOException e) {
     throw new DeleteFailedEngineException(shardId, delete, e);
   } finally {
     rwl.readLock().unlock();
   }
 }